Cho'Gath: Champion rework

1. Make Cho'Gath a Tank - Warden. To deal more damage to those who dive your allies (Tanks, Juggernauts, Divers, Fighters) but less to ADCs and APCs. He should be able to lead a charge (like Maokai, Alistar, Poppy) and be good at Peeling his allies.

2. Make more interactive passive in the lane and more reasonable passive ouside of the laning phase.

3. Move his current Q to his new E's passive to provide higher diversity in his kit = more depth and skill ceiling.

4. To differentiate him from other Tanks. Cho'Gath's role with his % true damages would be a Tank Buster.

If Cho'Gath successfully hits an enemy unit, he rips out a chunk of their flesh which lands beneath them and lasts 10 seconds. Cho'Gath can move over these chunks to consume them and restore 45 - 155 (based on level) health. If Cho'Gath's target is an enemy champion or epic monster, he rips out a larger chunk of their flesh which heals himself for additional 0 / 1.5 / 1.75 / 2% missing health per Feast stack.

Active:Cho'Gath charges forward, becoming immune to crowd control effects for the duration and deals magic damage to all enemies along the way, slowing them by 50% for 2 second. Afterwards, Cho'Gath is slowed by 20% for 1 second.

Magic Damage: 80 / 120 / 160 / 200 / 240 (+ 60% AP)

If Cho´Gath collides with the terrain or tower, he stops and creates a shock wave, dealing magic damage to all nearby enemies. If he does so, Cho´Gath is also briefly stunned for 0.25 seconds.

Active:Cho'Gath attempts to eat the target enemy, dealing true damage and healing himself for 30% of the damage done. Against non-champions the damage is increased to 1000 and killing one refunds 50 mana and halves Feast'scooldown.